Developing tank



P. w. SMITH.

DEVELOPING TANK.

APPLICATION FILED JUNE 20, I921.

Patented Alig. 1, 192 2. t

2 SHEETSSHEET 1- IN V EN TOR.

(P AETO RNEYS.

gN- -di P. W. SMITH.

' DEVELOPING TANK.

APPLICATION FILED JUNE 20, 1921.

l AZQAQ 8, Patented Aug. 1, 192,2.

2 SHEETSSHEET 2.

\ 5 IIIIIIIIIIH INVENTOR.,

rasrorri rnrnr w. stirrer, or noonnsran, NEW ironic :Dnvnnornvc- TANK.

; Application filed June 20,

To aZZ whom it may concern Be it known that l, PLINY W. SMITH, a citizen of the United States, residing at Rochester, in the county of Monroe and 5 State of New York, have invented certain new and useful lmprovements; in Develop ing Tanks, of which the following is a specification.

The object of this invention is to provide a new and improved form of developing tank for developing photographic negatives, more especially dental X-ray films in which the tank uses a minimum amount of developer and intended to be used in a bath of cold water to reduce the temperature of the developer.

This and other objects of the invention. will be fully illustrated in the drawing, described in the specification and pointed out in the claims at the end thereof.

In the drawings: Figure 1 18 a perspective view of the developing tank and rocker.

Figure 2 is a vertical transverse section r through the tank.

Figure 3 is a modified form of the tank showing a receptacle in which can be set the rocker, being a part of the receptacle.

Figure 4- is a perspective view of the receptacle alone slightly modified from the form, of the receptacle shown in. Figure 3.

Figure 5 is a perspective view of the developing tank with still another modification of the receptacle and the mount and rocker for the developing tank.

Figure 6 is a view of another form of the developing tank with a detachable rocker therefor. v

In the several figures of the drawing like reference numerals indicate like parts.

In the drawings, reference numeral 1 indicates a tank which preferably made long and hi gh and narrow and is open on the top 2 and is closed on the otherlive sides. Fas- 5 tened to the bottom of this tank the middle thereof and extending transversely thereto is a round bar 3 which serves as a rocker for the tank and also serves to hold the tank in an upright position, that is it 0 prevents the tank from tipping over side' wise, and acts as a weight Wh] ch contributes to holding the tank down when it is immersed ina receptacle of cold water. lhe length of the bar 3 is several times the width of the tank to which it is attached so as to fipccification of Letters Patent.

Patented Aug, 1,1922.

1921. Serial No. 478,917.

give the tank corresponding stability in holding it in its upright position.

In use, the tank is put into a receptacle of any convenient size which. receptacle contains cold water which lowers the temperature of the tank and the developer that is contained therein. The developer is put into the tank and the film to be developed is immersed in the developer and the tank is rocked back and forth on the rocker 8, The cold water cools the developer and secures the development of the film under the best conditions and the shape and size of the tank secures the development with the least amount of developing fluid. After the development is completed the film is removed and fixed in the usual way, and the tank can be emptied of the developer and cleaned.

In Figure 3 I have shown the developing tank without the rocker the rocker 4 in this case being made a permanent part of the receptacle 5 which vided with the bars 6, 7, 8 and 9 which run the length thereof and are fastened in the ends thereof and are spaced far enough apart to receive the developing tank 1 with suitable clearance. The developer is put in the tank 1 and the cool water in the surrounding tank 5. The tank 1 can then be rocked back and forth on the stationary rocker 1. In Figure 4 I have shown the same kind of a tank in which is provided the U shaped bars 10, 11, 12 and 13 which are fastened in the sides of the tank with clearance enough between them to receive the developing tank.

. In Figure 5 I have shown a similar tank 5 in which the wire cradle 15 is supported bent from a single piece of wire having a rocker 16 at the bottom and having side rails with clearance enough between them to receive the development tank and permit the rocking thereof whilethe cradle remains stationary.

In Figure 6 I have shown a developing tank 1 with a wire cradle 20 detachable therefrom which cradle has a rocker 21 at the bottom thereof on which the tank and rocker rests permitting the rocking of the tank and cradle.

I claim:

1. A relatively long and narrow develop ing tank having a rectangular bottom, a rocker attached to said bottom beneath and centrally thereof and transversely thereto,

said rocker being adapted torest on a plane receptacle is also prosurface and support the tank in an upright support said tank I in an upright position position While it rocks thereon. 1 While it rocks thereon, a larger tank sur- 2. A developing tank having high sides rounding said developing tank in which it is and endsalnd' a. long narrow reotangula-rbotadapted to be plated and from which it can 5 tom, said tank being adapted-t0 hold a pho-, be removed and in which it can freely rook tographic film on edge, a rookenattached on' said rocker, said tank being laterally beneath and to said bottom centrally therespaced from said larger tank by said rocker. of, and across said" bottom, said rocker ex- In testimony whereof I aflix my signature. tending beyond the sides of said tank and i 1.0 being adapted to rest on a plane surface and i i v PLINY W. SMITH. 

